fix: LC_ALL handling

docs/source/locale.rst

@@ -7,6 +7,6 @@ This is used for thousands separators in long numbers and decimal separators in
 
 If you wish to use a specific regional numbering preference while retaining a different base system language (e.g., English language with German-style numbering), pass the desired locale as a variable before launching DZGUI:
 
-``LC_NUMERIC=de_DE.UTF-8 ./dzgui``
+``LC_ALL=de_DE.UTF-8 ./dzgui``
 
 If you intend to use this frequently, you could wrap the above in a script or alias.